.header {
    z-index: 1;
    width: 100vw;
    height: 0.88rem;
    background: #ff4400;
    color: #fff;
    text-align: center;
    line-height: 0.8rem;
    position: fixed;
    left: 0;
    top: 0;
    font-size: 0.4rem;
  }